19991+199.1+19.91+1.991 88.88*0.9+22.22*6.4 简算
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19991+199.1+19.91+1.991 88.88*0.9+22.22*6.4 简算
19991+199.1+19.91+1.991
=20000-9+200-0.9+20-0.09+2-0.009
=20222-9.999
=20212.0001
88.88*0.9+22.22*6.4
=22.22x4x0.9+22.22x6.4
=22.22x(3.6+6.4)
=22.22x10
=222.2
(1)因为该数列为等比数列
所以原式=1.991(1-(1-10^4))/(1-10)
(2)原式=22.22(3.6+6.4)
=222.2
19991+199.1+19.91+1.991
=20000-9+200-0.9+20-0.09+2-0.009
=20222-9.999
=20222-10+0.001
=20212.001
88.88x0.9+22.22x6.4
=22.22x4x0.9+22.22x6.4
=22.22x(3.6+6.4)
=22.22x10
=222.2
19991+199.1+19.91+1.991 88.88*0.9+22.22*6.4 简算
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991=?(简便方法)
简算题1991+199.1+19.91+1.991=
1991+199.1+19.91+1.991
巧算题求解1991+199.1+19.91+1.991
1991+199.1+19.91+1.991+0.1991 怎么简便运算
用简便方法计算:1991+199.1+19.91+1.991
求 算术 1991+199.1+19.91+1.991=?求 算术 1991+199.1+19.91+1.991=?要一些过程,不要结果,要结果计算机
1991+199.1+19.91+1.991,用简便算法怎么算?四年级下学期奥数,应该有人会的,求帮助,谢啦~
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